221414521 has 4 divisors (see below), whose sum is σ = 221984100. Its totient is φ = 220844944.

The previous prime is 221414519. The next prime is 221414527. The reversal of 221414521 is 125414122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 125414122 = 2 ⋅62707061.

It can be written as a sum of positive squares in 2 ways, for example, as 52128400 + 169286121 = 7220^2 + 13011^2 .

It is a cyclic number.

It is not a de Polignac number, because 221414521 - 2¹ = 221414519 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221414492 and 221414501.

It is not an unprimeable number, because it can be changed into a prime (221414527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 284206 + ... + 284983.

It is an arithmetic number, because the mean of its divisors is an integer number (55496025).

Almost surely, 2^221414521 is an apocalyptic number.

It is an amenable number.

221414521 is a deficient number, since it is larger than the sum of its proper divisors (569579).

221414521 is an equidigital number, since it uses as much as digits as its factorization.

221414521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 569578.

The product of its digits is 640, while the sum is 22.

The square root of 221414521 is about 14880.0040658597. The cubic root of 221414521 is about 604.9721281243.

Adding to 221414521 its reverse (125414122), we get a palindrome (346828643).

It can be divided in two parts, 22141 and 4521, that added together give a palindrome (26662).

The spelling of 221414521 in words is "two hundred twenty-one million, four hundred fourteen thousand, five hundred twenty-one".